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chromium/third_party/blink/web_tests/fast/css-grid-layout/crash-opposite-subgrid.html 

<!DOCTYPE html>
<title>Opposite direction subgrids do not crash</title>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>

<div id="target" style="display: grid; grid-template-columns: 1fr 1fr 1fr;">
  <div id="subgrid" style="display: grid; grid-template-columns: subgrid; direction: rtl; grid-column: span 4;">x</div>
</div>
<script>
  test(() => {
    let subgrid = document.getElementById("subgrid");
    let actual = window.getComputedStyle(subgrid)['grid-template-columns'];
    assert_equals(actual, "subgrid [] [] [] [] []");
  }, 'Opposite direction subgrids do not crash');
</script>